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authorGuenter Roeck <linux@roeck-us.net>2021-10-19 06:03:32 +0300
committerGuenter Roeck <linux@roeck-us.net>2021-10-28 05:48:19 +0300
commitf8344f7693a25d9025a59d164450b50c6f5aa3c0 (patch)
tree183be1a0ad887f7b32f5115f30791ad9267c73bb /Documentation/hwmon
parentf347e249fcf920ad6974cbd898e2ec0b366a1c34 (diff)
downloadlinux-f8344f7693a25d9025a59d164450b50c6f5aa3c0.tar.xz
hwmon: (lm90) Add basic support for TI TMP461
TMP461 is almost identical to TMP451 and was actually detected as TMP451 with the existing lm90 driver if its I2C address is 0x4c. Add support for it to the lm90 driver. At the same time, improve the chip detection function to at least try to distinguish between TMP451 and TMP461. As a side effect, this fixes commit 24333ac26d01 ("hwmon: (tmp401) use smb word operations instead of 2 smb byte operations"). TMP461 does not support word operations on temperature registers, which causes bad temperature readings with the tmp401 driver. The lm90 driver does not perform word operations on temperature registers and thus does not have this problem. Support is listed as basic because TMP461 supports a sensor resolution of 0.0625 degrees C, while the lm90 driver assumes a resolution of 0.125 degrees C. Also, the TMP461 supports negative temperatures with its default temperature range, which is not the case for similar chips supported by the lm90 and the tmp401 drivers. Those limitations will be addressed with follow-up patches. Fixes: 24333ac26d01 ("hwmon: (tmp401) use smb word operations instead of 2 smb byte operations") Reported-by: David T. Wilson <david.wilson@nasa.gov> Cc: David T. Wilson <david.wilson@nasa.gov> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation/hwmon')
-rw-r--r--Documentation/hwmon/lm90.rst10
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/hwmon/lm90.rst b/Documentation/hwmon/lm90.rst
index 3da8c6e06a36..05391fb4042d 100644
--- a/Documentation/hwmon/lm90.rst
+++ b/Documentation/hwmon/lm90.rst
@@ -265,6 +265,16 @@ Supported chips:
https://www.ti.com/litv/pdf/sbos686
+ * Texas Instruments TMP461
+
+ Prefix: 'tmp461'
+
+ Addresses scanned: I2C 0x48 through 0x4F
+
+ Datasheet: Publicly available at TI website
+
+ https://www.ti.com/lit/gpn/tmp461
+
Author: Jean Delvare <jdelvare@suse.de>